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这题用第一类换元法求不定积分,凑微元时,为何它没有对 画银光笔处微分呢? 车辆在山区低等级冰雪道路遇坡道时,下坡车应当让上坡车先行.答案显示这个是错误的,原因是车辆在山区低等级冰雪道路遇坡道时,上坡车让下坡车先行是为了避免对上坡车所造成的危害增大 英语翻译每空一词：linda （ ）（ ）（ ）（ ）有四个空啊 还要加证明,例如已知,内错角这些.七点之前的有分.已知BE分别是AC,DF上的点,∠1=∠2,∠C=∠D（1）∠ABD与∠C相等么?为什么?（2）∠A与∠F相等么?为什么? 人人为我 ,我为人人 .我觉得这一种境界是颇耐人寻味的.为什么说这种境界是“耐 已知样本X1、X2……Xn的方差是2,则样本3X1+2、3X2+2、……3Xn+2的方差是多少? 0.5x+0.15x+(20-2x)*0.2=5.5 x=? 请问be involved in 与be involved with有什么区别呢, be involved in和involve in有区别吗 be involved in意思? be involved in与be involved with最明显的区别和用法是什么呢 be involved in有几种含义 She is looking at me as though I were mad.怎么选WERE he looked at the bag as if he were looking at sth ( ) beyond his comprehension为什么括号里不加which or that 不是限定sth吗为什么用were 不用was elisa试剂盒质量哪家好?学校实验要检测一些牛组织液,需要用到elisa试剂盒,请问哪家试剂盒比较好呢? elisa试剂盒哪家质量好?在实验的时候,温育需要特别注意哪些问题呢? 哪家ELISA试剂盒质量比较好? 英语翻译 This is the upward movement in the broadest sense of the world.怎么翻?in the broadest sense of 怎 英语翻译This sense of complete absorption in the struggle against nature is illustrated by the famous first line of the story:“None of them knew the color of the sky.” there would be three people involved in the supplier's comtetion of this business 化简:√(1/128) A.B两地只有上山和下坡,没有平路,一辆汽车上坡时每小时行20千米,下坡时每小时行35千米,这辆汽车从A地到B地需9/4小时,从B地到A地需15/8小时,问A、B两地间的公路长多少千米 将矩形ABCD对折,折痕为MN,再把B点叠在折痕MN上,若AB等于根号3,求AE的长 get involved 后面到底是跟in还是with? be involved invole和get involved with区别 (2+1)(2^2+1)(2^4+1)……(2^128+1)化简下 求：动圆x^2+y^2-(4m+2)x-2my+4m^2+4m+1=0的圆心的轨迹方程. 动圆x方+y方-(4m+2)x-2my+4m方+4m+1=0的圆心的轨迹方程是? 动 圆x²+y²–(4m+2）x–2my+4m²+4m+1=0的圆心的轨迹方程是什么 The millions of calculations involved,had they been done by hand,______all practical value by the time they were finished.A.could lose B.would have lost C.might lose D.ought to have lost求详解